Sofa



FIG. 1 is a front left perspective view of a sofa showing my new design;

FIG. 2 is a front right perspective thereof;

FIG. 3 is a front view showing two cushions;

FIG. 4 is a left side view thereof; and,

FIG. 5 is a right side view. 

The ornamental design for a sofa, as shown and described. 